Island



(No Model.)

M. TILLOTSON.

SELF CLOSING DOOR.

No. 386,042. Patented July 10, 1888.

UNITE STATES MARSHALL TILLOTSON, OF LAIVRENCE, MASSACHUSETTS, ASSIGNORTO THE PROVIDENCE STEAM AND GAS PIPE COMPANY, OF PROVIDENCE, RHODEISLAND.

SELF=CLOSING DOOR.

SPECIFICATION forming part of Letters Patent No. 386,042, dated July 10,1888.

Application filed March 17, V88.

To (all whom it may concern Be it known that I, hL-tRSI-IALL TILLOTSON,of Lawrence, Essex county, Massachusetts, haveinvented certain new anduseful Improvements in Automatic FireDoors, of which the following is aspecification.

The object of my invention is to provide means for automatically closinga door upon the occurrence of a fire without interfering to with theordinary opening and closing of the same.

The invention consists of a door or hatch arranged to close of itselfwhen released, a counterbalancing'weight connected to the door by acord, so as to counteract the self-closing tendency, and one or morefusible links or other heat-severed devices joining the cord and adaptedto disconnect the same upon an increase of temperature, and therebyallow the door to close.

In the accompanying drawings, Figure 1 represents a front elevation,showing the application of my invention to a sliding door. Fig. 2 is adiagrammatic view showing thein vention applied to a swinging door.

In Fig. l the door 1 is supported on an inclined track, 2, so as to havea tendency to close the doorway at 3 by sliding down the incline. Thedoor in effect tends to close by its own weight, and to keep itopen orhold it in any desired position I counteract this tend ency by cord 4and weight The cord is attached to the door at (5, and passed first overa fixed pulley, 7, and then across the doorway, and over another fixedpulley, 8, to the weight 5. The weight may be of such a size as to justcounteract the tendency of the door to close, so that the door may beopen or closed, or left in any desired position. The cord 4 is joined atone or more desirable places by devices that will be severed by anincrease of Serial No. 207,586. (No model.)

temperature above the normal. I. have shown for this purpose a link, 10,made of fusible solder; but any device capable of disconnecting the cordat abnormally-high temperature 5 would serve the purpose. It ispreferable to have the heat-severed device 10 located opposite thedoorway, so that the presence of heat on either side of the door willrupture the con nection and allow the door to close.

In Fig. 2 I have shown a swinging door, I, hinged at 11 and adapted toclose the doorway at 12. In this case the door is held open by weight 13pulling on acord, 4, the cord being joined at 10, with a fusible linkpassed around pulleys 15 16 17 and secured to the door at 18. A weight,19, hung from cord 20, which passes around pulley 21 and is socured tothe door at 18, serves to hold the door closed when closed, and also toautomatically close it when the cord 4 is disconnected.

It will be seen that from the arrangement of the pulleys the weight 13will have the advantage over the weight 19 when the door is open, whilewhen the door is closed the weight 19 5 will have the advantage. Thedoor may therefore be left open or closed at will, and when open willclose automatically when the link 10 is softened by heat.

I claim- The combination of a self-closing door with aconnterbalancing-weight tending to hold the door open, a cord connectingthe said weight and door and passing over a pulley and across thedoorway, the said cord being joined opposite the doorway with a devicecapable of being severed by heat.

MARSHALL TILLOTSON.

\Vitnesses:

HORACE C. J EALOUS, W. K. ANpEN.

